Power hammer



March 315914931. F, KQTT 1,798,378

P @WER HAMMER FiledAug. 8. 1927 2 Sheets-Sheet l 34 40 a j IZ jf 30 .//Z 39 v f/f f4, i ff iw" lll POWER HAMMER Filed Aug. e. 1927 2 sheets-sheer ,2

Quorum PatentedV Mar. 31, 1931 LEQ r, iorr, 0F Dia-Tagli?, MICHIGAN POWER esem@ Appucauqn mea august s; :1927. serial No. 211,591.

This invention relates to power 'hammers and has as an object to improve generally and renderimore efficient devices of this character.

A further Object of this invention is to plo vide a power hammer which is ysimple in construction, compact, andrei: such a size that it may be readily transported from place to place. 1Q A further object of this invention isto provide a power hammer in Which dependence is not placed on the motor actuated mechanism for ,imparting the working strokes to the hammer.

A still lfurtherobject of this Ainvention is .to provide a power hammer lhaving novel means for adjusting the forcevvith which the hammer operates, which means is independent ef the Operation 0f the motor actuating `20 mechanism.

Other objects and advantages of my invention will become apparent asy the description proceeds. l

In the drawings wherein one illustrative 25 embodiment of my inventive idea has been diclosed somewhat in detail:

Figure 1 .is a transverse sectional view through a hammer constructed in accordance lwith my invention; j

Figure 2 is a sectional view Vtalgen on the line 2.-2 0f Figur@ l;

Figure 3 is a sectional view .taken on the line 3-3 of Figure 1;

Figure 4 is a sectional View `taken en the line lr-t of Figure 1;

Figure '5 is a side elevational View of the hammer; and

Figure 6 is an .end View of ythe plunger ,casing showing more particularly :the latch mechanism associated `with lthe fsfarmie- Beierrng more Particularly tothe dravings wherein like reference ,characters designate corresponding parts throughout all :views of the same, the numeral ldesignats terf e an elongated casing `which Willzhereina referred to as the plunger-'casing While it- .S'Q'bi/igiis .that this casing may .have .any aired press section, the saine' is preferably ,cylindrical Vand #eternal @medellin-0.1.1@ and as .at .1.1 and 'interna 'lr threaded et lts other end as ldesip nated by Ythe reference plunger casing is a cap Y16, provided with a i Central aperture 17 for la to be described. y

Mounted for reciprocation within the casing 10 isa `plunger 18 having one'end adaptpurpese hereinafter ed for abutting engagement With'the head 19 ot an impact memberQO. The shank portion of this impact member is journalled in and projects? through the bore 14 of the closure plug 13 and is provided in its opposite sides With grooves 21, the bases of which areconnected by a transverse bore 21 If desired, suitable packing 20 may be provided between the" head 19 and the member 18 to slightly cushion the movement of the impact member. Detachably mounted on the outer end of the impact member 20 is the hammer head 2 2, the shank portion 28 of :which receives thel shank of the impact member.` Any suitable meansmay be provided for limiting 'outward movement of the hammer head 22 thS means `in the present embodiment constivtilting a ,U-shaped spring 2a having yits base arranged in :the bore 21 and its'le'gs inthe grooves 21. The legs of the U-shaped spring hear outwardly .against the Ainterior `of -the yshank 23 `of .the head thus frictionally preventing out'ward movement ofthe head. It

is obvious that a `new hammer 'head may be quickly s uhstituted'torthe old one by pulling the old o ne'oi against the frietional grip and fprcing a new -lreald on .the impact `member into engagement -vvitfh the "Spring, the legs ot' the spring seating in the grooves to :permit :th-iS movement Merate@ within the Casing '1.0 is a Spring 26 haring 911e @ed .ill .engagement :with .the Pleaser .18 and its @preste-.end in engage mentlvvith themovable vabutment 'plate .27.

arm 2 8 secured to theoute'r face of the @arable .Plat-e. 27 and ,Pleests thrash the aperture 17 in the cap member 1G. The outer end of the arm 28 may be provided with a head 29 and one edge of this arm is provided with a plurality of ratchet teeth 30.

Carried by the cap 1G is a latch mechanism for engagement with the ratchet teeth 30 on the arm 28. This latch mechanism includes a housing 81 secured to the cap 16, which housing is open at its lower end and is provided in its outer face with a slot 32. Slidably mounted within the housing 31 is a latch member 33 yieldably urged downwardly by a spring 84 arranged between the upper end of the latch member 88 and the top of the housing. The latch 33 has a cam engaging portion 84 which engages the ratchet teeth 8O to prevent outward movement of the arm 28. As clearly illustrated in Figure 1 of the drawings, these teeth are so arranged that if the arm 28 is pressed inwardly, the cam surfaces of the teeth and the latch member cooperate .to force the latch member upwardly against the tension of the spring. To release the latch member to permit outward movement of the arm 28, there is provided a stem 35 carried by the latch member and eX- tending through the slot 32 formed in the housing 81.

Secured in any suitable manner to the under side of the casing 10 is a gear casing 86. This casing is provided with a slot 87 which is in alignment with slots 88 and 39 formed .in the upper and lower walls respectively of the casing 10 and there is provided a pin which extends through the plunger 18, and the slots 37. 88 and 39 respectively as clearly illustrated in Figure 1 of the drawing. The easing 36 is also provided with a centrally arranged boss 41 which in the preilerred construction, is integral with the bottom 42 of the casing.

Rotatably mounted ou the boss 41 is a gear member 43 having internal gear teeth 44. The gear member 43 has an upper plane surface 45 to which is secured, as by screws 46, a cam member 47 provided with a plurality of spaced cams 48. As clearly shown in Figure 2 of the drawings these cam members 48 are adapted to engage the lower end of the pin 40 whereby rotation of the gear member 43 and the cam member 47 moves the pin 40 in the slots 87, 38 and 39, the plunger 18 bcing carried by this movement, away from the impact member 2() against the tension of the spring 2G. Any suitable means such as a washer 49 and a nut 50 may be provided for securely positioning the gear member 43 on the boss 41.

Closing the outer side of the casing 36, is a cover 51 which cover may be held in place by a nut 52 threaded on the outer end of the boss 41. The cover and nut cooperate to brace the outer end of the boss 41 to prevent breaking of the boss at the point where it projects from the bottom 42 of the easing.

This cover 51 carries a depending casing 53 which casingforms a housing for the drive shaft 54.

Loosely mounted on the upper end of the drive shaft 54 and in meshing engagement with the gear teeth 44 is a driving pinion having a bearing engagement as at 5G with a. suitable iiange 57 extending inwardly from the cover 51 and in alignment with the walls of the casing 53.

For coupling the drive shaft 54 to the driving pinion there is provided a clutch mechanism which includes a movable clutch member 58 mounted on a squared portion 59 of the shaft 54. The movable clutch member is provided with a groove 60 adjacent its upper end and has formed on its upper face, a. clutch surface 61 adapted to be moved into engagement with the corresponding clutch surface 62 formed on the lower end of the pinion gear 55.

For sliding the movable clutch member 58 into engagement with the pinion 55 there is provided a bifurcated yoke G3 which engages the slot 60 formed in the movable clutch member. This yoke 63 is bent as at G4 to form the downwardly extending port-ion (i5 which extends parallel to and adjacent the casing 58. For normally urging the yoke (i3 and the clutch member 58 downwardly, a spring 6G is arranged between the furcations of the yoke, this spring having its lower end in engagement with the base of the furcations and its upper end in engagement with a bolt 67 carried by the casing 5? and projecting through the furcatious of the yoke. A suitable cover plate 68 is provided for holding the spring in place and this cover plate is secured in proximity to the outer face ol the yoke by the nut 69 which threadedly engages the. outer free end of the bolt GT.

To actuate the yoke 63 there is provided, a lever 70 pivoted as at 71 to a band T2 which encireles the casing 53. As will be clearly seen from Figure 5 of the drawings, the bolt 71 serves not only as a pivot for the lever 7() but also as a means for uniting the free ends of the band 7 2 whereby this band is rigidly clamped on the casing 53. The lever T0 is provided with a linger opening 7? and a shouldered portion T4 which shouldered portion adapted for engagement with the lower free end of the yoke 63.

.forces the pin 40 and the plunger 18 backwardly against the tension of the spring 26 until the peak of the cam 48 moves out of the path of tra-Vel of the pin 40 whereupon the plunger 18 is released and forced forwardly by the tension of the spring 26. 'In

the cap 16. This decreases the travel of the pin 40 in the slots 37, 38, and 39 and conse-v quently the stroke of the plunger.

The shoulder 15 on the plug 18 engages thc end of the casing 10 after a predetermined adjustment to prevent movement of the pin.

l0 beyond a point where it would be out of the path of the cams 48.

It will thus be seen that I have provided a novel means for actuating a power haininer, which means is independent insofar as its force is concerned, of the speed of the motor used for actuating the hammer. The motor driven mechanism merely functions to retract the plunger while the spring 26 serves to provide the force with which the b-low is struck. By virtue of the means provided for adjusting the tension of the spring and by virtue also of the ready accessibility of the spring whereby a stronger spring may easily be substituted in the event it is desired, itV

will be seen that I have provided simple and effective means for regulating the force of the blows struck by the hammer.

`While one embodiment of my inventive idea has been described somewhat in detail, it is to be clearly understood that these drawings and description are for the purpose of illustration only and are not to be construed as definitive of the limits of the invention. The right is therefore reserved to make such changes in the details of construction and arrangement of parts as will fall within the purview of the accompanying claims.

What I claim as my invention is:

1. A power hammer including in combination, a plunger casing, a plunger reciprocable within said casing, a spring within said casing for urging the plunger in one direction, mea-ns for moving the plunger in opposition to the force exerted by said spring, and means for adjusting the tension of said spring, said last -mentioned means including a plate like member engageable with the free end of the spring and adjustable longitudinally of the said casing, an arm carried by the plate like member and means enga geable with the arm for locking the plate like member in adjusted position.

2. A power hammer including in combinaion, a plunger casing, a plunger reciprocable within said casing, a spring within said casing for urging the plunger in one direction,

means for moving the plunger Vin opposition to the force-eXerted by ,said spring, land means for .adjusting `the tension of said spring, said last mentioned ineansincluding a plate like member engageable with the free end of the spring and adjustable longitudinally of .the said casing, an arm carried bythe plate like meinberratchet Yteeth formed on the said.arm,and a latch member engageable with the said .ratchet teeth for locking .the plate like member. in adjusted position.

3. A power hammer including in :combination,arplungercasing, an apertured cap closing oneend of the said casing, a plunger reciprocable within said casing, a spring withinv said casing for 'urging the plunger in one direction, means for moving the plungern oppositionto the force exerted by said spring,

va plate cngageable with the free end of the said. spring, the said plate being movable to l adjust the tension ofthe said spring, anarm 'securedv to the said plateand .projecting .through` the aperture in the cap, a housing carried'by the cap adjacent `the aperture therein, a latch within the said housing and L a spring urging the latch in engagement with the said arm, the, said latch being'operable to prevent movement of the said arm in one direction.

4. In a. aower hammer a slotted aluner casing, a plunger within the said plunger casing, a. spring constantly urging the said plunger ".i one direction., a pin carried by the said plunger and projecting through the said slots in the plunger casing, a second cas ing secured to the said plunger casing, the said second casing being provided with a slot registering with the slots in the plunger casing, a cam within the said second casing engageable with the pin carried by the plunger, a drive shaft, a movable clutch member on the drive shaft for coupling the said drive shaft to the said cam, and L-shaped yoke for actuating the said movable clutch member, and a pivoted lever engageable with the free end of the said yoke for moving the same.

5. The combination in a power hammer, of a plunger, a cam for moving said plunger, a drive shaft, a. drive shaft casing, a clutch for coupling the said drive shaft to said cam, a yoke for moving the said clutch member, a lever for moving the said yoke, and means for pivotally mounting the said lever, said means including a band encircling the said drive shaft casing and a connection between the free ends of the said band for clamping the said band to the drive shaft casing and forming a pivot pin for the said lever.

6. The combination in a power hammer, of a plunger, a cam for moving the said plunger, a drive shaft, a casing enclosing the said drive shaft, a movable clutch member on the said drive shaft for coupling the drive shaft to the said cam, a yoke for actuating said clutch, member, a spring engageable with the said yoke for urging the clutch to releasing position, a bolt carried by the drive shaft casing and projecting through the furoations of the said yoke, the said belt :forminor an abutment for the said spring, a cover pclate, forming With the furcations of the yoke, a housing for the said spring, and means for maintaining the said Cover plate in engagement With the said yoke, said means including a threaded member engageable with the free end of the said bolt.

7. In a po'wer hammer, a plunger easing having an elongated slot therein, a plunger within said easing, a spring normally urging the plunger in one direction, a pin carried by the plunger and projecting through the elongated slot in the plunger casing, a cam arranged exteriorly of the plunger casing and 9,0 engageable With said pin, means for actuating the cam including, a drive shaft, having a gear freely rotatably mounted thereon, a second gear secured to said cam and adapted to mesh with the gear aforesaid, and a clutch for securing said first mentioned gear to the drive shaft.

In testimony whereof I aflix my signature.

LEO F. KOTT. 

